/* roulang page: index */
:root {
            --bg-main: #070B14;
            --bg-card: rgba(15, 23, 42, 0.72);
            --tech-blue: #1D63FF;
            --cyan-glow: #00D2FF;
            --neon-orange: #FF7D00;
            --text-main: #F8FAFC;
            --text-muted: rgba(255, 255, 255, 0.7);
            --border-glow: rgba(0, 210, 255, 0.22);
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            background-color: var(--bg-main);
            color: var(--text-main);
            font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans CN", sans-serif;
            line-height: 1.7;
            overflow-x: hidden;
        }

        /* 玻璃拟态与发光面板 */
        .glass-panel {
            background: var(--bg-card);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border: 1px solid rgba(255, 255, 255, 0.08);
            box-shadow: 0 16px 40px rgba(0, 0, 0, 0.5);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        .glass-panel:hover {
            border-color: var(--border-glow);
            box-shadow: 0 20px 45px rgba(0, 210, 255, 0.12);
        }

        .glass-danger {
            background: rgba(25, 14, 23, 0.75);
            backdrop-filter: blur(18px);
            border: 1px solid rgba(255, 87, 87, 0.25);
            box-shadow: 0 12px 36px rgba(255, 70, 70, 0.08);
            transition: all 0.3s ease;
        }

        .glass-danger:hover {
            border-color: rgba(255, 87, 87, 0.6);
            transform: translateY(-4px);
        }

        /* 强发光按钮 */
        .glow-btn-primary {
            background: linear-gradient(135deg, #1D63FF 0%, #00D2FF 100%);
            box-shadow: 0 0 24px rgba(0, 210, 255, 0.45);
            transition: all 0.3s ease;
        }

        .glow-btn-primary:hover {
            box-shadow: 0 0 35px rgba(0, 210, 255, 0.75);
            transform: translateY(-2px);
            filter: brightness(1.1);
        }

        .glow-btn-secondary {
            background: rgba(255, 255, 255, 0.05);
            border: 1px solid rgba(0, 210, 255, 0.3);
            backdrop-filter: blur(10px);
            transition: all 0.3s ease;
        }

        .glow-btn-secondary:hover {
            background: rgba(0, 210, 255, 0.15);
            border-color: #00D2FF;
            color: #00D2FF;
        }

        /* 渐变标题字色 */
        .text-glow-gradient {
            background: linear-gradient(135deg, #FFFFFF 30%, #00D2FF 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .glow-badge {
            background: rgba(0, 210, 255, 0.1);
            border: 1px solid rgba(0, 210, 255, 0.35);
            color: #00D2FF;
        }

        /* 脉冲光斑背景 */
        .radial-bg {
            background: radial-gradient(circle at 50% 20%, rgba(29, 99, 255, 0.16) 0%, rgba(7, 11, 20, 0) 70%);
        }

        /* 手风琴平滑旋转与过渡 */
        details summary::-webkit-details-marker {
            display: none;
        }
        details[open] summary .faq-icon {
            transform: rotate(180deg);
            color: #00D2FF;
        }
        details[open] {
            border-color: rgba(0, 210, 255, 0.4);
        }

        /* 自定义输入框焦点光圈 */
        .form-input {
            background: rgba(255, 255, 255, 0.04);
            border: 1px solid rgba(255, 255, 255, 0.12);
            transition: all 0.3s ease;
        }
        .form-input:focus {
            outline: none;
            border-color: #00D2FF;
            box-shadow: 0 0 16px rgba(0, 210, 255, 0.35);
            background: rgba(15, 23, 42, 0.85);
        }